关键词: 社会网络, 信任模型, 仿真

Abstract: The theory of social network and the harvest of trust models are researched.After combining of the trait of the internet business and social network，and taking the trust decay brought by time，risk rank and the close degree of the relationship between nodes into consideration，and a trust computing model that combines these factors is built.After the simulation，boast problems can be efficiently identified，and this model also can refrain the behavior that nodes use the small scale business to accumulate the trust value，in order to cheat in the big scale business.A simulation result shows the feasibility of the model.

Key words: social network, trust model, simulation